public function load_choices()
 {
     if (is_array($this->choices)) {
         return true;
     }
     $this->choices = make_categories_options();
     return true;
 }

 /**
  * Load the available choices for the select box
  *
  * @return bool
  */
 public function load_choices()
 {
     global $CFG;
     require_once $CFG->dirroot . '/course/lib.php';
     if (is_array($this->choices)) {
         return true;
     }
     $this->choices = make_categories_options();
     return true;
 }

    // only local users if username selected, no mnet users!
    $settings->add(new admin_setting_configselect('enrol_database/localuserfield', get_string('localuserfield', 'enrol_database'), '', 'idnumber', $options));
    $options = array('id' => 'id', 'shortname' => 'shortname');
    $settings->add(new admin_setting_configselect('enrol_database/localrolefield', get_string('localrolefield', 'enrol_database'), '', 'shortname', $options));
    $options = array('id' => 'id', 'idnumber' => 'idnumber');
    $settings->add(new admin_setting_configselect('enrol_database/localcategoryfield', get_string('localcategoryfield', 'enrol_database'), '', 'id', $options));
    $settings->add(new admin_setting_heading('enrol_database_remoteheader', get_string('settingsheaderremote', 'enrol_database'), ''));
    $settings->add(new admin_setting_configtext('enrol_database/remoteenroltable', get_string('remoteenroltable', 'enrol_database'), get_string('remoteenroltable_desc', 'enrol_database'), ''));
    $settings->add(new admin_setting_configtext('enrol_database/remotecoursefield', get_string('remotecoursefield', 'enrol_database'), get_string('remotecoursefield_desc', 'enrol_database'), ''));
    $settings->add(new admin_setting_configtext('enrol_database/remoteuserfield', get_string('remoteuserfield', 'enrol_database'), get_string('remoteuserfield_desc', 'enrol_database'), ''));
    $settings->add(new admin_setting_configtext('enrol_database/remoterolefield', get_string('remoterolefield', 'enrol_database'), get_string('remoterolefield_desc', 'enrol_database'), ''));
    if (!during_initial_install()) {
        $options = get_default_enrol_roles(context_system::instance());
        $student = get_archetype_roles('student');
        $student = reset($student);
        $settings->add(new admin_setting_configselect('enrol_database/defaultrole', get_string('defaultrole', 'enrol_database'), get_string('defaultrole_desc', 'enrol_database'), $student->id, $options));
    }
    $settings->add(new admin_setting_configcheckbox('enrol_database/ignorehiddencourses', get_string('ignorehiddencourses', 'enrol_database'), get_string('ignorehiddencourses_desc', 'enrol_database'), 0));
    $options = array(ENROL_EXT_REMOVED_UNENROL => get_string('extremovedunenrol', 'enrol'), ENROL_EXT_REMOVED_KEEP => get_string('extremovedkeep', 'enrol'), ENROL_EXT_REMOVED_SUSPEND => get_string('extremovedsuspend', 'enrol'), ENROL_EXT_REMOVED_SUSPENDNOROLES => get_string('extremovedsuspendnoroles', 'enrol'));
    $settings->add(new admin_setting_configselect('enrol_database/unenrolaction', get_string('extremovedaction', 'enrol'), get_string('extremovedaction_help', 'enrol'), ENROL_EXT_REMOVED_UNENROL, $options));
    $settings->add(new admin_setting_heading('enrol_database_newcoursesheader', get_string('settingsheadernewcourses', 'enrol_database'), ''));
    $settings->add(new admin_setting_configtext('enrol_database/newcoursetable', get_string('newcoursetable', 'enrol_database'), get_string('newcoursetable_desc', 'enrol_database'), ''));
    $settings->add(new admin_setting_configtext('enrol_database/newcoursefullname', get_string('newcoursefullname', 'enrol_database'), '', 'fullname'));
    $settings->add(new admin_setting_configtext('enrol_database/newcourseshortname', get_string('newcourseshortname', 'enrol_database'), '', 'shortname'));
    $settings->add(new admin_setting_configtext('enrol_database/newcourseidnumber', get_string('newcourseidnumber', 'enrol_database'), '', 'idnumber'));
    $settings->add(new admin_setting_configtext('enrol_database/newcoursecategory', get_string('newcoursecategory', 'enrol_database'), '', ''));
    if (!during_initial_install()) {
        $settings->add(new admin_setting_configselect('enrol_database/defaultcategory', get_string('defaultcategory', 'enrol_database'), get_string('defaultcategory_desc', 'enrol_database'), 1, make_categories_options()));
    }
    $settings->add(new admin_setting_configtext('enrol_database/templatecourse', get_string('templatecourse', 'enrol_database'), get_string('templatecourse_desc', 'enrol_database'), ''));
}

<?php

// $Id: courses.php,v 1.14 2007/08/09 21:51:00 jamiesensei Exp $
// This file defines settingpages and externalpages under the "courses" category
$ADMIN->add('courses', new admin_externalpage('coursemgmt', get_string('coursemgmt', 'admin'), $CFG->wwwroot . '/course/index.php?categoryedit=on', 'moodle/category:update'));
$ADMIN->add('courses', new admin_externalpage('enrolment', get_string('enrolments'), $CFG->wwwroot . '/' . $CFG->admin . '/enrol.php'));
// "courserequests" settingpage
$temp = new admin_settingpage('courserequest', get_string('courserequest'));
$temp->add(new admin_setting_configcheckbox('enablecourserequests', get_string('enablecourserequests', 'admin'), get_string('configenablecourserequests', 'admin'), 0));
require_once $CFG->dirroot . '/course/lib.php';
$temp->add(new admin_setting_configselect('defaultrequestcategory', get_string('defaultrequestcategory', 'admin'), get_string('configdefaultrequestcategory', 'admin'), 1, make_categories_options()));
$ADMIN->add('courses', $temp);
// "backups" settingpage
$temp = new admin_settingpage('backups', get_string('backups', 'admin'), 'moodle/site:backup');
$temp->add(new admin_setting_backupcheckbox('backup_sche_modules', get_string('includemodules'), get_string('backupincludemoduleshelp'), 0));
$temp->add(new admin_setting_backupcheckbox('backup_sche_withuserdata', get_string('includemoduleuserdata'), get_string('backupincludemoduleuserdatahelp'), 0));
$temp->add(new admin_setting_backupcheckbox('backup_sche_metacourse', get_string('metacourse'), get_string('backupmetacoursehelp'), 0));
$temp->add(new admin_setting_backupselect('backup_sche_users', get_string('users'), get_string('backupusershelp'), 0, array(0 => get_string('all'), 1 => get_string('course'))));
$temp->add(new admin_setting_backupcheckbox('backup_sche_logs', get_string('logs'), get_string('backuplogshelp'), 0));
$temp->add(new admin_setting_backupcheckbox('backup_sche_userfiles', get_string('userfiles'), get_string('backupuserfileshelp'), 0));
$temp->add(new admin_setting_backupcheckbox('backup_sche_coursefiles', get_string('coursefiles'), get_string('backupcoursefileshelp'), 0));
$temp->add(new admin_setting_backupcheckbox('backup_sche_sitefiles', get_string('sitefiles'), get_string('backupsitefileshelp'), 0));
$temp->add(new admin_setting_backupcheckbox('backup_sche_messages', get_string('messages', 'message'), get_string('backupmessageshelp', 'message'), 0));
$temp->add(new admin_setting_backupselect('backup_sche_keep', get_string('keep'), get_string('backupkeephelp'), 1, array(0 => get_string('all'), 1 => '1', 2 => '2', 5 => '5', 10 => '10', 20 => '20', 30 => '30', 40 => '40', 50 => '50', 100 => '100', 200 => '200', 300 => '300', 400 => '400', 500 => '500')));
$temp->add(new admin_setting_backupcheckbox('backup_sche_active', get_string('active'), get_string('backupactivehelp'), 0));
$temp->add(new admin_setting_special_backupdays());
$temp->add(new admin_setting_special_backuptime());
$temp->add(new admin_setting_special_backupsaveto());
$ADMIN->add('courses', $temp);

        $options = array();
        $options[LDAP_DEREF_NEVER] = get_string('no');
        $options[LDAP_DEREF_ALWAYS] = get_string('yes');
        $settings->add(new admin_setting_configselect('enrol_ldap/opt_deref', get_string('opt_deref_key', 'enrol_ldap'), get_string('opt_deref', 'enrol_ldap'), 0, $options));
        $settings->add(new admin_setting_configtext_trim_lower('enrol_ldap/idnumber_attribute', get_string('idnumber_attribute_key', 'enrol_ldap'), get_string('idnumber_attribute', 'enrol_ldap'), '', true, true));
        //--- course mapping settings ---
        $settings->add(new admin_setting_heading('enrol_ldap_course_settings', get_string('course_settings', 'enrol_ldap'), ''));
        $settings->add(new admin_setting_configtext_trim_lower('enrol_ldap/objectclass', get_string('objectclass_key', 'enrol_ldap'), get_string('objectclass', 'enrol_ldap'), ''));
        $coursefields = array('idnumber', 'shortname', 'fullname', 'summary');
        foreach ($coursefields as $field) {
            $settings->add(new admin_setting_configtext_trim_lower('enrol_ldap/course_' . $field, get_string('course_' . $field . '_key', 'enrol_ldap'), get_string('course_' . $field, 'enrol_ldap'), '', true, true));
        }
        $settings->add(new admin_setting_configcheckbox('enrol_ldap/ignorehiddencourses', get_string('ignorehiddencourses', 'enrol_database'), get_string('ignorehiddencourses_desc', 'enrol_database'), 0));
        $options = array(ENROL_EXT_REMOVED_UNENROL => get_string('extremovedunenrol', 'enrol'), ENROL_EXT_REMOVED_KEEP => get_string('extremovedkeep', 'enrol'), ENROL_EXT_REMOVED_SUSPEND => get_string('extremovedsuspend', 'enrol'), ENROL_EXT_REMOVED_SUSPENDNOROLES => get_string('extremovedsuspendnoroles', 'enrol'));
        $settings->add(new admin_setting_configselect('enrol_ldap/unenrolaction', get_string('extremovedaction', 'enrol'), get_string('extremovedaction_help', 'enrol'), ENROL_EXT_REMOVED_UNENROL, $options));
        //--- course creation settings ---
        $settings->add(new admin_setting_heading('enrol_ldap_autocreation_settings', get_string('autocreation_settings', 'enrol_ldap'), ''));
        $options = $yesno;
        $settings->add(new admin_setting_configselect('enrol_ldap/autocreate', get_string('autocreate_key', 'enrol_ldap'), get_string('autocreate', 'enrol_ldap'), 0, $options));
        if (!during_initial_install()) {
            $options = make_categories_options();
            $settings->add(new admin_setting_configselect('enrol_ldap/category', get_string('category_key', 'enrol_ldap'), get_string('category', 'enrol_ldap'), key($options), $options));
        }
        $settings->add(new admin_setting_configtext_trim_lower('enrol_ldap/template', get_string('template_key', 'enrol_ldap'), get_string('template', 'enrol_ldap'), ''));
        //--- nested groups settings ---
        $settings->add(new admin_setting_heading('enrol_ldap_nested_groups_settings', get_string('nested_groups_settings', 'enrol_ldap'), ''));
        $options = $yesno;
        $settings->add(new admin_setting_configselect('enrol_ldap/nested_groups', get_string('nested_groups_key', 'enrol_ldap'), get_string('nested_groups', 'enrol_ldap'), 0, $options));
        $settings->add(new admin_setting_configtext_trim_lower('enrol_ldap/group_memberofattribute', get_string('group_memberofattribute_key', 'enrol_ldap'), get_string('group_memberofattribute', 'enrol_ldap'), '', true, true));
    }
}